The present report gives a detailed description of all samples received from Frome-Broken Hill Co. Pty. Ltd., together with some stratigraphical notes. A preliminary report on a selection of these samples (1947/076) was submitted in December, 1947.

This report describes the results of the micropalaeontological examination of five rock samples collected from the south side of the Desert Basin.

Brief description of diatomite from Tincurrin.

It has been fairly firmly established that the fineness of the gold in any ore deposit varies with the depth from the surface at which the deposit was formed and as a corollary to this, that it is dependent upon the temperature and pressure at the time of deposition. This relationship is such that, under certain conditions, the gold fineness, taken into consideration with other recognised criteria, furnishes a very sensitive and reliable guide to the relative temperature of ore formation, at least within the epithermal and the upper part of the mesothermal range. The definition, determination, relation to deposits, and application of gold fineness are discussed in this report.

At the request of the Broken Hill Proprietary a geophysical test survey, employing gravity and magnetic methods, was carried out near Wollongong, N.S.W. by geophysicists of the Bureau. The area over which these tests were made is part of the Southern Coalfield of N.S.W. and plans are being made to develop a colliery in it. The subsurface geology is known in part from five drill holes, namely, Nebo No. 2, 5, and 6 and Wongawilli No. 7 and 8. Basalt sills of considerable thickness were encountered in Nebo No. 6 and Wongawilli No. 8. The proximity of sills to the coal seams has resulted, in parts of the Southern Coalfield, in the cindering of the coal, and for this reason it is a matter of considerable importance in planning a colliery to know the area occupied by the sills. The technical aspects of testing, results, and conclusions are discussed in this report.

Following the recommendations of an earlier investigation, a visit was arranged in June, 1947, to inspect the deposits near Hampton, at Toowoomba, and in the South Burnett District. As a result of this inspection it was decided to start a testing campaign on Portion 194v, Wooroolin and to follow this work by testing in the vicinity of Portion 206v. The method to be employed and scope of any further work was to be modified in the light of experience gained at the first two areas, called Kingaroy No. 1 and Kingaroy No. 2 respectively. The geology of the area, methods of testing, and the nature of the laterite are described in this report. A comparison of the results of searches by the Queensland Geological Survey and by the Australian Aluminium Production Company is given. Accompanying plans are included.

This work was undertaken to extend regional mapping in the central and western portions of the A.C.T. and to provide a geological map of the Cotter River Area for use in engineering investigations. The regional geology portion of the Cotter Valley between Gingera and Bull's Head had previously been mapped on a scale of 1/2 mile to the inch, and this map was extended, by the recent survey, northwards to the Territory border and north-easterly to the Murrumbidgee River.

This report is a preliminary description of geophysical work undertaken by officers of the Geophysical Section at the request of the Zinc Corporation Ltd., in connection with the search for structures in the Frome Embayment which may contain natural gas and oil. The object of the survey, methods, results, and interpretation of the results are discussed in this report. Accompanying plans are included.

This report describes the results of an examination of six samples taken from a cutting approximately 40 miles north of Injune.

In November, 1947, at the joint request of the Queensland Government and four companies which are associated with the search for oil in the area, the Bureau commenced geophysical work in the Roma district of Central Queensland. During the first phase of the geophysical operations, gravity and magnetic methods were applied in the reconnaissance of a large area. The object of these operations was to disclose gravity or magnetic anomalies which might be related to geological structures, indicate the broader structural elements of the sedimentary basin in which the oil and gas occur, and enable areas to be selected for investigation by more exact methods. The purpose of this report is to state clearly the geological problem and the geophysical methods adopted in the attempt to solve it. The geology of the area, possible oil-bearing structures, and the application of geophysical methods to date, are discussed. A sketch map and geological section plan are included.